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Residential Mortgage Loans Held in Securitization Trusts, Net and Real Estate Owned - Delinquencies in Portfolio of Residential Mortgage Loans Held in Securitization Trusts (Details) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 USD ($) loan | Dec. 31, 2017 USD ($) loan
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Real estate owned through foreclosure, Number of Delinquent Loans | loan | 1 | 1
Real estate owned through foreclosure, Total Unpaid Principal | $ | $ 118 | $ 118
Real estate owned through foreclosure, % of Loan Portfolio | 0.17% | 0.15%
30 - 60 |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Number of Delinquent Loans | loan | 1 | 1
Total Unpaid Principal | $ | $ 311 | $ 203
% of Loan Portfolio | 0.45% | 0.26%
61 - 90 |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Number of Delinquent Loans | loan | 1 | 1
Total Unpaid Principal | $ | $ 170 | $ 173
% of Loan Portfolio | 0.24% | 0.22%
90 |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Number of Delinquent Loans | loan | 22 | 24
Total Unpaid Principal | $ | $ 14,481 | $ 16,147
% of Loan Portfolio | 20.82% | 20.80%

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- Definition Financing Receivable, Recorded Investment Past Due, Real Estate Owned Through Foreclosure. + References No definition available. + Details
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- Definition The aggregate percentage of the loan portfolio through foreclosure. + References No definition available. + Details
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- Definition Recorded Investment in financing receivables that are past due at the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953401-111524 + Details
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